Hebrew word for day is "yom". I think we all know that. It can refer to..........
1. The 24-hour period of time that it takes for the earth to rotate on its axis.
2. It can also refer to the period of daylight between dawn and dusk.
3. And it can refer to an unspecified period of time.
Genesis 8:22...........
"While the earth remaineth, seedtime and harvest, and cold and heat, and summer and winter, and day and night shall not cease
It seems to me that the Scripture there verifies COLD and WINTER.
With all due respect, how in the world can we assume that there was NO icy weather until after the flood.
I agree that Genesis mentions seasons in relation to the creation of the heavenly bodies, summer and winter seasonal heat and cold as such are not mentioned in Scripture until after the Flood but IMHO it is a real stretch to say that there were no icy whether conditions in the earth.